“Jersey Shore” Star Vinny Guadagnino Shows Off Dramatic Weight Loss

@vinnyguadagnino/Instagram(NEW YORK) -- Vinny Guadagnino is a whole new man!

The former Jersey Shore star revealed a newly toned body on Instagram on Tuesday.

“#transformationtuesday,” he captioned the photo. “3 week cleanse!”

On a second photo, he wrote, “One more for #transformationtuesday#instagramstraightflexin #nofilter #3weeksdiet/cardio/lifting . See you in 3 more.”

Last year, Guadagnino, 25, who hosts The Show With Vinny on MTV, wrote a book about living with general anxiety disorder, and opened up about his diet and workout regimen.

“Eating right can be tough, but as a general rule I try to balance out my diet with 'stress-free' foods — lean proteins, organic fruits and vegetables, and whole grains,” he wrote. “Why? Our minds and physical bodies are one hundred percent connected, so I know that if I eat like garbage, not only will I feel like garbage, but also my mood and overall mental state will suffer.”